Sentence examples for however difficult to define from inspiring English sources

Based on our experience with a norovirus outbreak in pediatric oncology patients [ 29] and our recent investigation of rotavirus infections in a matched pairs analysis [ 30], the surveillance of gastrointestinal HAI in pediatric cancer patients should include at least rotavirus, norovirus, and CDAD, which is, however, difficult to define in this population [ 31].

However, the exact origin of such defects is still difficult to define.

Its precise boundaries, however, are difficult to define inasmuch as the local enhancement in numbers of galaxies above the cosmological average in all likelihood just blends smoothly into the background.

The precise beginning and end of the case may however prove difficult to define.

Essentiality, however, is difficult to define because its application is necessarily restricted to the experimental conditions being tested.

What that something was, however, was curiously difficult to define.

The 'first galaxies', however, are more difficult to define (see Bromm and Yoshida 2011).

However, it is difficult to define the exact class as the extreme condition for triggering landslides.

A tight fit is reflected in small values of the outputs from these equations, however 'small' is difficult to define.

Clearly the fastest transients at the start of bright stimuli can occur in the time-scale of 5 20 ms. However, it is difficult to define when the integration stops and adaptation starts in the WT responses.

However, it is difficult to define to which extent symptom severity can be compatible with work.